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JOURNAL OF PLANKTON RESEARCH | VOLUME 18 | NUMBER 10 | PAGES 1917-1930 | 1996
© Oxford University Press

research-article

Temporal and spatial distribution of the ichthyotoxic dinoflagellate Gyrodinium aureolum Hulburt in the St Lawrence, Canada

D. Blasco, L. Bérard-Therriault, M. Levasseur and E.G. Vrieling1

Department of Fisheries and Oceans, Maurice Lamontagne Institute PO Box 1000, Mont-Joli, Québec, G5H3Z4, Canada 1Department of Marine Biology, University of Groningen, Biological Center PO Box 14, 9750 AA Haren, The Netherlands

Received on October 25, 1995; accepted on June 5, 1996 The occurrence of the potentially ichthyotoxic dinoflagellate Gyrodinium aureolum Hulburt is reported for the first time in the Lower Estuary and Gulf of St Lawrence. Taxonomic identification using an iramunochemical tagging method suggests a close taxonomic proximity between the species found in the St Lawrence and G.aureolum present in European waters. In 1993, G.aureolum was observed along the entire coast of Quebec and in offshore waters of the Gulf of St Lawrence. At the coastal stations, G.aureolum showed large week-to-week variations, but higher densities were observed during late August and early September. Bloom concentrations (106 cells 1–1) were only observed in the Gaspé Current at Mont-Louis, on the north coast of the Gaspd peninsula. In the central part of the Gulf, G.aureolum was concentrated in the upper 5 m of the stations directly influenced by the freshwater run-off of the St Lawrence Estuary. Results from principal component analysis indicate that G.aureolum favors environments with high nitrogen recycling activity.


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